renamed/combined some functions and added irq ack and soundnmi disable
port 0 d0 is vblank bit (see tigerh game start)
sharedram is 2KB
s3: added configuration registers for Trio/Virge chipsets.  Are read-only for now. (no whatsnew)
cleanup
rename these sets:
getstar -> grdian
gtstarb1 -> getstarb1
gtstarb2 -> getstarb2
add support for savestates
nw